Fig.3.

The final atlas of the glabellar frown lines grading scale.

Five main classes: 1, 3, 5, 7 and 9 representing yet visible wrinkle, visible fine wrinkle; well-defined moderate wrinkle, deep carven edges wrinkle, and redundant folds. Class 2, 4, 6 and 8 were between the main classes. Class 1: Very shallow or lines yet visible wrinkle; Class 2: Just visible wirnkle, like hazy crease; Class 3: Visible wrinkle, like light clear crease; Class 4: Clearly visible weinkle; Class 5: Clearly visible wrinkle and well-defined edges; Class 6: Moderately deep wrinkle; Class 7: Deep wrinkle and carven edges; Class 8: Deep and prominent wrinkle with furrow; Class 9: Redundant folds.